A big breakthrough in this space came in September 2013, when Coinpayments.net was launched. They provided shopping cart software that could take cryptocurrency payments, and the cost was a small transaction fee levied on the retailer (0.5%, which is way lower than what the credit card processors charge).
The number of supported coins is vast - 54 coins at the moment. The list of supported coins is at the bottom of this post.
Unfortunately not a lot of ecommerce retailers have bothered to do anything with this software from the looks of their store list. Some retailers have enabled payment for most of the coins, others just for BTC and LTC.
Goods on sale range from books to heating appliances. LTC has the biggest presence, followed by Doge with 34 stores and Devcoin with 21 stores.
If you have run out of money and are looking to your crypytocurrency to buy you some food, only Devcoin caters to you. The Devcoin store sells Walmart and Tacobell vouchers.
Is any of this stuff important? Well the more uses for a coin the more of a network effect you get. Coins that just exist to be mined and dumped on exchanges are kind of pointless.
List of supported coins:
BTC Bitcoin , LTC Litecoin , ADT AndroidsTokens , ANC Anoncoin , BQC BBQCoin , CAP BottleCaps , CAT Catcoin , CGB CryptogenicBullion , DGC DigitalCoin , DMD Diamond , DOGE Dogecoin , DVC Devcoin , EAC Earthcoin , FRC Freicoin , FRK Franko , FST FastCoin , FTC Feathercoin , FZ Frozen , GLD Goldcoin , GME GameCoin , GRA Grain , ICN iCoin , IFC Infinitecoin , KDC KlondikeCoin , KGC Krugercoin , MAX Maxcoin , MEC Megacoin , MINT MintCoin , MMC MemoryCoin , MZC MazaCoin , NET Netcoin , NKA IncaKoin , NMC Namecoin , NOBL NobleCoin , NVC Novacoin , NXT NXT , ORB Orbitcoin , PPC Peercoin , PT Platinum Coin , QRK Quark , RED Redcoin , SBC StableCoin , SPT Spots , STR Starcoin , SXC Sexcoin , TRC Terracoin , UNO Unobtanium , WDC Worldcoin , XHD HashDollar , XIV Xivra , XPM PrimeCoin , ZET Zetacoin , LTCT Litecoin Testnet
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Method 1: Looking for altcoins with a big community
Method 2: Which coins are being searched for?
Method 3: Which coins are the miners about to dump?
Method 5: the Daily Maintenance Cost
Method 6: How Pumps and Dumps Work
Method 7: Trading Thunderclaps
Method 8: Trading Block Reward Halvings